208 – Mary Marvel!

An image from Captain Marvel #18, November 1942
An image from Captain Marvel #18, November 1942

The Marvel Family expands again in Captain Marvel #18 (November 1942) with the addition of the female version of Captain Marvel Jr: Mary Marvel. Mary was the newly discovered twin sister of Billy Batson. I believe Bulletgirl was the first female version of a superhero (1941), followed one month later by Hawkgirl.